ORC International Certificate


ORC International certificates comes in four A4 pages. The first page gives a general presentation of the boat with its rated boat speeds, in addition to the main hull, propeller, rig and sail measurements.

It also contains information needed to enter the race like crew weight, limitations on use of sails, and stability index with the rated righting moment.




   Page 1




   Page 2




   Page 3




   Page 4

The second page is presenting scoring options in two sections: default scoring options that are present on each certificate and other scoring options that are selected for use by the relevant National Rating office. 

The third page is showing a detailed list of measurements of the Hull and appendages, propeller, rig, flotation, stability, and the measurement inventory. The fourth page is reserved for measurements within the sails inventory. 

Place the cursor over different parts of the certificate page for a brief explanation. More details are given in the measurement and scoring sections, while complete definitions can be found in the appropriate rules documents.

National Rating Office scoring options details: USA - Canada.

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This is a space for the Rating Office logo. ORC Rating Offices are established worldwide in each country that has active offshore racing. Rating offices have several functions, including supervising the measurement and rating of yachts, supporting ORC racing by administering to their national fleets, and issuing ORC certificates.

For countries where a National Rating Office is not yet established, the central ORC Rating office can give support by issuing certificates.


There are three types of ORC International certificates that may be valid at the same time for any boat: general with full crew, Double Handed, and/or Non-Spinnaker, labelled clearly in this box. These will have their GPH, CDL and ratings on Page 2 calculated specifically for that type.

Header on the ORC International Double Handed Certificate

Header on the ORC International Non-Spinnaker Certificate

An ORC certificate provides a range of ratings, expressed as Time Allowances in s/NM for different wind conditions in the range of 6 – 20 knots of true wind speed for an optimum beat, and for 52, 60, 75, 90, 110, 120, 135, 150 degrees of true wind angle for an optimum run.
These time allowances are used in Performance Curve Scoring as a unique feature that is fundamentally different and much more precise than any other handicap system. It can rate different boats for different race conditions and course configurations by giving the boat’s theoretical predicted speeds for any wind condition and direction.

Time allowances for 7 wind speeds are also given for two pre-defined courses: Windward/Leeward is a conventional course where the race course consists of 50% upwind and 50% downwind legs, while the All Purpose course type includes equal distribution of all wind directions.

The Time on Distance and Time on Time single number ratings are shown here for Windward/Leeward and All-purpose course models determined as a mix of all wind angles with wind speeds distributed across a range of values from 6 to 20 knots, as described in ORC Rule 403.2.
The second half of this page is reserved for National Rating Office Scoring Options that may be defined by each National Rating Office. This may include Time on Distance and/or Time on Time coefficients using different course models as well as multiple Time on Distance and/or Time on Time coefficients for different wind ranges. The course type used to calculate these ratings and the methods of how they will be applied shall be specified in the Notice of Race and/or Sailing Instructions of the races and events that use them.races and events that use them.

Click for sample certificate with different country specific scoring options.


ORC Reference number is a unique number identifying that certificate and may be retrieved in the ORC database available at the ORC Sailor Services.

There is an issue date as well as a VPP version used together with the latest date for the validity of the certificate.  

A boat shall have only one valid certificate at any one time. The valid certificate is the last one issued.

ORC Certificates are valid for one year. This is because the VPP software calculations are updated yearly based on the ITC’s latest research of aero and hydrodynamics, as well as improvements made from analysis of race results and boat performance during the racing season, and submissions made from ORC Nominating Bodies.